Ayurveda offers two major medicines, which author has experienced to be quite useful.

1 Brahmi Ghrutam:  give just 1/2 tsp in 1/2 cup warm milk, morning and at bed time. THis ghrutam is a paste made from cow butter, boiling several herbs along with it to make ghrutam. These herbs strengthen brain tissues, memmory, cognitive intelligence.

2. Smruti Sagar Ras: Grasping power and memory is enhanced by this formulation. Several herbs addressing brain tissues invigoration are used to make this formulation.

Both of these will be avaialable at online pharmacies.